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MIMO-OFDM is one viable solution for high data rate transmissions over underwater acoustic channels. The authors' previous work in has reported experimental results for MIMO-OFDM with two transmitters and QPSK modulation. In this paper, they deal with MIMO-OFDM with more transmitters and higher order modulation. With data collected from the RACE experiment at Narragansett Bay, Rhode Island, March 2008, they report MIMO-OFDM performance results of QPSK/8- QAM/16-QAM/64-QAM modulations with two transmitters, QPSK/8-QAM/16-QAM modulations with three transmitters, and QPSK/8-QAM modulations with four transmitters.
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